It's worth watching this series for two things. Firstly the special effects and unusual powers are fascinating and different - he can heal and won't die but isn't extra strong. Secondly the usually sweet Jung Hae In in such a horror sci fi setting does a great job. Can feel his pain. The villain played by Go Kyung Pyo is quite effective as well. There are a few faults. The violence could have been toned down - it's a bit sickening. Secondly it's not over yet. When is Season 2? Thirdly it actually seems rushed in that some connecting explanatory scenes seem to be lacking. This is one of the few series that should have been longer. I felt I had to guess what happend sometimes. But at least it wasn't draggy.